id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
32307	Venable, F. P. (Francis Preston)	A Brief Account of Radio-activity			.txt	text/plain	12802	792	65	The beginning--Radio-active bodies--An atomic property--Discovery of new radio-active bodies--Discovery for new radio-active bodies--Methods of investigation--Nature particles--Electrical charge--Helium formed from alpha nucleus--Determination of the atomic number--Use of X-ray spectra--Changes caused by ray-emission--Atomic weight the lead obtained from radio-active minerals differs in atomic weight A large number of other radio-active substances have been separated The radiations from radio-active bodies can discharge both positively The alpha rays have a positive electrical charge and a comparatively thorium and radium were found to give off a radio-active gas. In order to measure the disintegration of a radio-active body in units radio-active substances, the nature of the rays produced must be radio-active body, as radium _C_, which expels alpha particles with a Each alpha particle emitted means a loss of 4 in the atomic weight. [Illustration: RADIO-ACTIVE ELEMENTS FROM URANIUM AND THORIUM Radio-active bodies, elemental nature of, 20 Radio-activity, an atomic property, 3	./cache/32307.txt	./txt/32307.txt